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Li N.,Shandong Agricultural University | Li N.,CAS Research Center for Eco Environmental Sciences | Shan B.,CAS Research Center for Eco Environmental Sciences | Tang W.,CAS Research Center for Eco Environmental Sciences | Wang Y.,Key Laboratory of Agricultural Environment in Universities of Shandong
Chinese Journal of Environmental Engineering | Year: 2013

Powder activated carbon (PAC) with rich microporous structure was prepared from rice husks by carbonizing, activating, pickling, washing and drying, and its specific surface area (BET) was 886.3 m2/g. The adsorption process of PAC to phosphorus (P) was studied. The results showed that the adsorption isotherm could be described by both Langmuir model (R2 = 0.9284) and Freundlich model (R2 = 0.9208), and the saturated adsorption capacity reached 6.93 mg/g. The adsorption process of PAC to P could be described by pseudo second-order kinetic equation (R2 = 0.9968), and the rate of adsorption was under the control of intra-particle diffusion. PAC, as available, cheap and efficient matrix filler, has bright prospects in ecological treatment technologies of rural sewage.


Yang L.,Shandong Agricultural University | Song X.,Shandong Agricultural University | Wang Y.,Shandong Agricultural University | Wang Y.,Key Laboratory of Agricultural Environment in Universities of Shandong | And 2 more authors.
Chinese Journal of Environmental Engineering | Year: 2013

Indigo jean dyeing wastewater is a kind of unmanageable wastewater because it has complicated constituents, the concentration is high and the quantity of wastewater is large. To effectively reduce the burthen of the following biological treatment, iron-carbon micro-electrolysis was applied to treat indigo jean dyeing wastewater in this experiment. The influences of the three factors including pH, reaction time and the ratio of Iron-carbon were investigated with the orthogonal test, every influencing factor was tested. Finally, the optimal process conditions were ascertained. The experimental results showed when the ratio of iron and carbon was 2:1, the pH was 3, the reaction time was 90 min, the removal rate of COD by iron-carbon micro-electrolysis process was 49.2%.


Dai D.,National Engineering Laboratory for Efficient Utilization of Soil and Fertilizer Resources | Dai D.,Shandong Agricultural University | Dai D.,Key Laboratory of Agricultural Environment in Universities of Shandong | Xu R.,National Engineering Laboratory for Efficient Utilization of Soil and Fertilizer Resources | And 14 more authors.
Chinese Journal of Environmental Engineering | Year: 2014

Ferroelectric was severed as cathode and anode in the electric flocculation system to study the treatment efficiency of the denim dyeing and printing wastewater. The factors of electrode voltage, reaction time and pH were examined to evaluate the removal effect of COD and chromaticity of the flocculation method. According to the experiment results, electrode voltage and reaction time were the main influencing factors compared to pH 24 V of electrode voltage, 35 min of reacting time and 7.4 of pH could deal to the best removal efficiency. Under these conditions, the decolurization rate could arrive at 99% and the removal rate of COD was around 70%. In conclusion, the electrolytic flocculation system can be used as the pretreatment process in the cleaning of denim dyeing and printing wastewater.

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